Stuff like that you can tell from the Trello progress of the game, where it currently says 3 forms in total
ok is the crystal for Veronika third size inside the temple that says something about a cold breeze
The third form is the 2nd crystal, the first form was the starting one
the ones I found were one in the area with the fairies and second was in the temple that has mana golems, so where is the one I’m missing
You're not missing any
1st form = Starting size
2nd form = 1 upgrade
3rd form = 2 upgrades
ok
